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Databricks Certified Data Engineer Professional Sample Questions:

1. A data engineer is using Auto Loader to read incoming JSON data as it arrives. They have configured Auto Loader to quarantine invalid JSON records but notice that over time, some records are being quarantined even though they are well-formed JSON.
The code snippet is:
df = (spark.readStream
.format("cloudFiles")
.option("cloudFiles.format", "json")
.option("badRecordsPath", "/tmp/somewhere/badRecordsPath")
.schema("a int, b int")
.load("/Volumes/catalog/schema/raw_data/"))
What is the cause of the missing data?

A) The engineer forgot to set the option "cloudFiles.quarantineMode" = "rescue".
B) At some point, the upstream data provider switched everything to multi-line JSON.
C) The badRecordsPath location is accumulating many small files.
D) The source data is valid JSON but does not conform to the defined schema in some way.

2. A data engineer is tasked with ensuring that a Delta table in Databricks continuously retains deleted files for 15 days (instead of the default 7 days), in order to permanently comply with the organization's data retention policy. Which code snippet correctly sets this retention period for deleted files?

A) spark.conf.set("spark.databricks.delta.deletedFileRetentionDuration", "15 days")
B) spark.sql("VACUUM my_table RETAIN 15 HOURS")
C) spark.sql("ALTER TABLE my_table SET TBLPROPERTIES
('delta.deletedFileRetentionDuration' = 'interval 15 days')")
D) from delta.tables import *
deltaTable = DeltaTable.forPath(spark, "/mnt/data/my_table")
deltaTable.deletedFileRetentionDuration = "interval 15 days"

3. A workspace admin has created a new catalog called finance_data and wants to delegate permission management to a finance team lead without giving them full admin rights. Which privilege should be granted to the finance team lead?

A) GRANT OPTION privilege on the finance_data catalog.
B) ALL PRIVILEGES on the finance_data catalog.
C) MANAGE privilege on the finance_data catalog.
D) Make the finance team lead a metastore admin.

4. A data engineer wants to ingest a large collection of image files (JPEG and PNG) from cloud object storage into a Unity Catalog-managed table for analysis and visualization. Which two configurations and practices are recommended to incrementally ingest these images into the table? (Choose two.)

A) Use Auto Loader and set cloudFiles.format to "IMAGE".
B) Use the pathGlobFilter option to select only image files (e.g., "*.jpg,*.png").
C) Move files to a volume and read with SQL editor.
D) Use Auto Loader and set cloudFiles.format to "BINARYFILE".
E) Use Auto Loader and set cloudFiles.format to "TEXT".

5. The data engineering team maintains the following code:

Assuming that this code produces logically correct results and the data in the source table has been de-duplicated and validated, which statement describes what will occur when this code is executed?

A) The gold_customer_lifetime_sales_summary table will be overwritten by aggregated values calculated from all records in the silver_customer_sales table as a batch job.
B) An incremental job will detect if new rows have been written to the silver_customer_sales table; if new rows are detected, all aggregates will be recalculated and used to overwrite the gold_customer_lifetime_sales_summary table.
C) A batch job will update the gold_customer_lifetime_sales_summary table, replacing only those rows that have different values than the current version of the table, using customer_id as the primary key.
D) The silver_customer_sales table will be overwritten by aggregated values calculated from all records in the gold_customer_lifetime_sales_summary table as a batch job.
E) An incremental job will leverage running information in the state store to update aggregate values in the gold_customer_lifetime_sales_summary table.

Solutions: